Don't even think about installing CHINESE 811'a horizontally into any
30L1. Cathodes will sag..and short. The only thing that will work in a
30L1 is chinese 572B's.
Chinese 811's are piss poor at the best of times, they don't hi-pot test
very high. Typ on ameritron AL-811 amps, 572B's are used for tube
replacements.
Rob nailed it. Stick with old school 3-500Z amps. They are very easy to
maintain, and easy to modify and upgrade. Stay away from megabuck tubes
like 8877, 3CX-800's etc. Both have floozy grids, and require grid
overcurrent protection. I would stay away from russian tetrodes and
triodes as well.
Jim VE7RF
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